Reputation: 43

How to reading XML from a URL in Android

I want to read a XML document from a URL:

public void DownloadXmlFile() throws IOException{
        //TODO
        String url = "http://api.m1858.com/coursebook.xml";
        URL u = new URL(url);
        HttpURLConnection conn = (HttpURLConnection) u.openConnection();
        conn.setReadTimeout(10000);
        conn.setConnectTimeout(15000);
        conn.setRequestMethod("GET");
        conn.setDoInput(true);
        conn.connect();
    }

I get an Error Exception

android.os.NetworkOnMainThreadException

I added uses-permission in manifest file:

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

Upvotes: 2

Answers (3)

Parag Ghetiya

Reputation: 421

there are two step for read data from server...

1.Make a HTTP request to get the data from the webservice 2.Parse a XML document and read the contents

try 
    {

        URL url = new URL("http://www.w3schools.com/xml/note.xml");

        DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
        DocumentBuilder db = dbf.newDocumentBuilder();
        Document doc = db.parse(new InputSource(url.openStream()));
        doc.getDocumentElement().normalize();

        NodeList nodeList = doc.getElementsByTagName("note");
        /** Assign textview array lenght by arraylist size */


        to = new TextView[nodeList.getLength()];
        from = new TextView[nodeList.getLength()];
        heading = new TextView[nodeList.getLength()];
        body = new TextView[nodeList.getLength()];



        for (int i = 0; i < nodeList.getLength(); i++) 
        {
            Node node = nodeList.item(i);

            to[i] = new TextView(this);
            from[i] = new TextView(this);
            body[i] = new TextView(this);
            heading[i] = new TextView(this);

            Element fstElmnt = (Element) node;
            NodeList toList = fstElmnt.getElementsByTagName("to");
            Element nameElement = (Element) toList.item(0);
            toList = nameElement.getChildNodes();
            to[i].setText("To = "+ ((Node) toList.item(0)).getNodeValue());

            NodeList fromList = fstElmnt.getElementsByTagName("from");
            Element fromElement = (Element) fromList.item(0);
            fromList = fromElement.getChildNodes();
            from[i].setText("from = "+ ((Node) fromList.item(0)).getNodeValue());

            NodeList headingList = fstElmnt.getElementsByTagName("heading");
            Element headingElement = (Element) headingList.item(0);
            headingList = headingElement.getChildNodes();
            heading[i].setText("heading = "+ ((Node) headingList.item(0)).getNodeValue());


            NodeList bodyList = fstElmnt.getElementsByTagName("body");
            Element bodyElement = (Element) bodyList.item(0);
            bodyList = bodyElement.getChildNodes();
            body[i].setText("body = "+ ((Node) bodyList.item(0)).getNodeValue());

            layout.addView(to[i]);
            layout.addView(from[i]);
            layout.addView(heading[i]);
            layout.addView(body[i]);

        }
    } 
    catch (Exception e) 
    {
        System.out.println("XML Pasing Excpetion = " + e);
    }

Upvotes: 2